Almost 150 NHS patients have been harmed by incidents that should never happen, according to new figures, including the wrong patient receiving heart surgery, patients given overdoses and one woman who had her fallopian tube removed instead of her appendix.
The incidents - called "never events" - are regarded by the Government as so serious they should never happen.
New figures from NHS England show there were 148 never events in the six months from April to September.
Overall, there were 69 cases where foreign objects were left inside patients, including 11 cases of surgical swabs, three cases where specimen retrieval bags were left inside, one patient who had wires left inside and another patient who was left with a needle in their body.
In one incident, a drill guide block was left inside the patient's body.
The figures also showed that 37 patients had the wrong part of their body operated on or treated.
This included four operations on the wrong tooth, an operation on the wrong toe, one patient who had an injection in the wrong eye and one case where a woman had the wrong fallopian tube removed during an ectopic pregnancy, probably rendering her infertile.
Another woman had a fallopian tube removed instead of her appendix.
Other details showed the wrong patient undergoing a heart procedure, and the wrong patient given an invasive colonoscopy to check their bowel.
In another case, the patient died as a result of failure to monitor their oxygen levels, while one woman died from heavy bleeding following a planned Caesarean section.
Another had the wrong type of gas given, resulting in the patient's death or severe harm, and one patient underwent surgery intended for someone else "due to incorrect results filed in notes".
Meanwhile, 21 patients were given the wrong implant or prosthesis.
Seven patients were given the wrong dose of chemotherapy, resulting in harm, and five died or suffered severe harm after feeding tubes were inserted incorrectly by NHS staff.
In more than five cases, patients were given overdoses of drugs, with a weekly dose given in a single day.
Other patients were given different overdoses, and there was one case of "maladministration of potassium-containing solutions causing death or severe harm".
Some NHS trusts had more never events than others, with Newcastle Upon Tyne Hospitals NHS Foundation Trust having the most at four.
This included two incidents where foreign objects were left inside patients, one patient who had a procedure on the wrong part of their body and one patient given the wrong type of implant.
Today's six-monthly figures are broadly comparable to last year's figures.
In the previous 12 months, there were 325 never events, suggesting this year's number could be similar.